Improvement in the manufacture of paper-pulp



printed matter are prcvented, and alsothe atplates written or printed imasnsually made I introduce, while it in the engine, nine pounds ofhydrated soap, either incorporated with the pulp I add a mineral orInstead" of metallic salts, I attain the desired a have found twopoundssutficient for two hunsolution of carbonate of .soda or pearlash, add-UNITED STATES PATENT OFFICE.

HENRY, GLYNN, 0F BALTIMORE, MARYLAND.

IMPROVEMENT IN THE MA NUFAICTU RE- or PAPER-PULP.

' 'Specification forming part of Letters Patent No. 12,361, datedFebruary 6, 1855 To all whom it may concern: Be it known that I, HENRYGLYNN, of Baltimore, in the State of MarylanrL-ln tve discovcredimprovements in the manufacture of pa-v pcr by which forgery by tranfersor attempts at alteration after obliteration of written or.

tacks of vermin and the effects of damp are My improvements are-confinedto the prepamad'e. I impregnate the paper with fatty substances or'waxto such a degree that the snr-.

receive transfer-impressions shall be equallyand uniformly acted on-thatis to say, by the ,the blank parts 'of the document as by the written orprinted parts- -so that attemptsfto pressions on my paper-arefrustrated. 1 e Into two hundred and fifty pounds of .pulp

potash or soda, previously dissolved in boiling water, and when thissoap is thoroughly metallic saltin such quantities as. to render theintroduced soap insoluble. Six pounds ot sulphate of copper I have foundsuflicient; but the quantity may be varied according to the-v qualitiesot'--the so'apand the purposes for which the paper is designed.

results by a-sulphatc ofmagnesia', of which tired and fifty pounds ofpulp. "Inaddition to ordinarysoaps L also use onein which bees orvegetable wax is introduced in place of fatty substances. When-I use wax1 dissolve itbefore introducing it-into the pulp in a boiling 'ing' thealkali till the wax is thoroughly dissolved. Papertre'ated with thissoap resists the effects of damp and. the attacks of vermin. It is'wellknown that rats and other vermin iii the tropics never attack waxcandles or other objects of wax under the-severest gnawings of hunger.Being indigestible, it would kill them, and hence instinct impels themto reject it.

Among the advantages I obtain from the introduction ofinsolublesoaps-into the pulp are:

First, a greater quantity of fatty substances is embodied in the paperthan is otherwise practicable. v v Sec0nd, I get rid of the labor andmachinery hitherto necessary to saturate the soluble solutions areemployed.

Third, while sizing with'alnm is incompatible, il'not impossible,withsnch solutions, [am

enabled to size with it in the ordinary manner and with theordinarytacility.

Fourth, by insoluble soaps I attain security against fraudulenttransfers that is unattainable with solu blesoaps.

Fifth, expensive phosphates have bcen proposcdtorender metallicsaltsinsolublc in pulp;

bntby my process they are unnecessary, and 1 am enabled tomanufacturepapers posscssing' the. advantages herein recited at a costlit= tie exceeding that of ordinary papers.

Sixtlnby the use of insoluble soaps of wax or fa-t'a smoothersurt'ace isgiven to the'pa-per, I

and I avoid the usual operation of washing the pulp and the accompanyinents. t v a Seventh, paper-hangings made by my pro cess are not subject-to mold 'or mildew, and

books made of it resist the ravages of vermin.

I claim-- Introducing into the imlpy mass soluble soaps of wax or fats,made as set forth, converting the same into insoluble soaps within thepulp by means of soluble salts, substantially as described, for thepurposes of preventing forgcry, mildew, and the action of ill-:

sects, rats, and vermin.

HENRY GLYNN.

Witnesses: 4

JOHN F. CLARK, W. S. CLARK.v

paper when 7 loss of ingredi-

